Create WireMock.Net.MimePart project (#1300)

* Create WireMock.Net.MimePart project

* .

* REFACTOR

* ILRepack

* --

* ...

* x

* x

* .

* fix

* public class MimePartMatcher

* shared

* min

* .

* <!--<DelaySign>true</DelaySign>-->

* Update README.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

src/WireMock.Net.Minimal/Http/HttpRequestMessageHelper.cs

@@ -0,0 +1,107 @@
+// Copyright © WireMock.Net
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http;
+using System.Net.Http.Headers;
+using Newtonsoft.Json;
+using Stef.Validation;
+using WireMock.Constants;
+using WireMock.Types;
+using WireMock.Util;
+
+namespace WireMock.Http;
+
+internal static class HttpRequestMessageHelper
+{
+    private static readonly IDictionary<string, bool> ContentLengthHeaderAllowed = new Dictionary<string, bool>(StringComparer.OrdinalIgnoreCase)
+    {
+        { HttpRequestMethod.HEAD, true }
+    };
+
+    internal static HttpRequestMessage Create(IRequestMessage requestMessage, string url)
+    {
+        Guard.NotNull(requestMessage);
+        Guard.NotNullOrEmpty(url);
+
+        var httpRequestMessage = new HttpRequestMessage(new HttpMethod(requestMessage.Method), url);
+
+        MediaTypeHeaderValue? contentType = null;
+        if (requestMessage.Headers != null && requestMessage.Headers.ContainsKey(HttpKnownHeaderNames.ContentType))
+        {
+            var value = requestMessage.Headers[HttpKnownHeaderNames.ContentType].FirstOrDefault();
+            MediaTypeHeaderValue.TryParse(value, out contentType);
+        }
+
+        var bodyData = requestMessage.BodyData;
+        httpRequestMessage.Content = bodyData?.DetectedBodyType switch
+        {
+            BodyType.Bytes => ByteArrayContentHelper.Create(bodyData.BodyAsBytes!, contentType),
+            BodyType.Json => StringContentHelper.Create(JsonConvert.SerializeObject(bodyData.BodyAsJson), contentType),
+            BodyType.String => StringContentHelper.Create(bodyData.BodyAsString!, contentType),
+            BodyType.FormUrlEncoded => StringContentHelper.Create(bodyData.BodyAsString!, contentType),
+            BodyType.MultiPart => StringContentHelper.Create(bodyData.BodyAsString!, contentType),
+
+            _ => httpRequestMessage.Content
+        };
+
+        // Overwrite the host header
+        httpRequestMessage.Headers.Host = new Uri(url).Authority;
+
+        // Set other headers if present
+        if (requestMessage.Headers == null || requestMessage.Headers.Count == 0)
+        {
+            return httpRequestMessage;
+        }
+
+        var excludeHeaders = new List<string> { HttpKnownHeaderNames.Host };
+
+        var contentLengthHeaderAllowed = ContentLengthHeaderAllowed.TryGetValue(requestMessage.Method, out var allowed) && allowed;
+        if (contentLengthHeaderAllowed)
+        {
+            // Set Content to empty ByteArray to be able to set the Content-Length on the content in case of a HEAD method.
+            httpRequestMessage.Content ??= new ByteArrayContent([]);
+        }
+        else
+        {
+            excludeHeaders.Add(HttpKnownHeaderNames.ContentLength);
+        }
+
+        if (contentType != null)
+        {
+            // Content-Type should be set on the content
+            excludeHeaders.Add(HttpKnownHeaderNames.ContentType);
+        }
+
+        foreach (var header in requestMessage.Headers.Where(h => !excludeHeaders.Contains(h.Key, StringComparer.OrdinalIgnoreCase)))
+        {
+            // Skip if already added. We need to ToList() else calling httpRequestMessage.Headers.Contains() with a header starting with a ":" throws an exception.
+            if (httpRequestMessage.Headers.ToList().Any(h => string.Equals(h.Key, header.Key, StringComparison.OrdinalIgnoreCase)))
+            {
+                continue;
+            }
+
+            // Skip if already added. We need to ToList() else calling httpRequestMessage.Content.Headers.Contains(...) with a header starting with a ":" throws an exception.
+            if (httpRequestMessage.Content != null && httpRequestMessage.Content.Headers.ToList().Any(h => string.Equals(h.Key, header.Key, StringComparison.OrdinalIgnoreCase)))
+            {
+                continue;
+            }
+
+            // Try to add to request headers. If failed - try to add to content headers. If still fails, just ignore this header.
+            try
+            {
+                if (!httpRequestMessage.Headers.TryAddWithoutValidation(header.Key, header.Value))
+                {
+                    httpRequestMessage.Content?.Headers.TryAddWithoutValidation(header.Key, header.Value);
+                }
+            }
+            catch
+            {
+                // Just continue
+            }
+        }
+
+        return httpRequestMessage;
+    }
+}